html,
body {
	width: 100%;
	height: 100%;
	background-color: black;
}

.header_div {
	position: fixed;
	top: 0px;
	left: 0px;
	right: 0px;
	height: 56px;
	line-height: 56px;
	color: lightgrey;
	text-align: center;
	font-size: 20px;
	border-bottom: lightgrey solid 1px;
	background-color: black;
}

.back_div {
	position: fixed;
	top: 0px;
	left: 0px;
	height: 56px;
	line-height: 56px;
	color: lightgrey;
	text-align: center;
	font-size: 20px;
	margin-left: 10px;
}

.content_div {
	margin-top: 66px;
	color: lightgrey;
	margin-bottom: 10px;
}

.task_div {
	height: 64px;
	margin-left: 20px;
	margin-right: 20px;
	margin-top: 10px;
	line-height: 64px;
	background-color: black;
	color: lightgrey;
	font-size: 20px;
	border: lightgrey solid 1px;
	text-align: center;
}
